JPS61144131A - Burst radio communication equipment - Google Patents

Abstract

PURPOSE:To decrease the power capacity by using a capacitor charged in advance by a battery so as to supply power to a transmission circuit in a radio equipment making transmission in a burst way. CONSTITUTION:A transmission data inputted by a transmission message input device 1 is stored at first in a memory 2. Then the information stored in the memory 2 is transmitted to a transmission circuit 3 comprising a modulation circuit and a power amplifier section and a burst radio wave is transmitted from an antenna 4. The capacitor 6 charged by the battery 5 in advance is used to supply power to the transmission circuit 3. The timing of power supply to the transmission circuit 3 is taken just before a data is transmitted from the memory 2 to the transmission circuit 3. Thus, the electric energy stored in the capacitor 6 is utilized effectively.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a burst wireless communication device.

[Technical background of the invention and its problems]

BACKGROUND ART Conventionally, there has been a desire for a portable wireless communication device that is small and has a long range. In general, the reachable distance of a wireless device is g! The higher the transmitter's radio wave output and the narrower the wireless bandwidth, the longer the transmission time will be. In the case of portable wireless devices, the transmitted radio wave output is often limited by the capacity of the battery used as a power source (and the wireless bandwidth is determined by the bandwidth of the source information to be transmitted and the modulation method).

In normal voice communication, the required wireless bandwidth is usually at least the voice bandwidth (3 KHz) or more.

One method of reducing wireless bandwidth is to use a voice band compression device, but this requires a complicated and expensive compression device and is not practical. Furthermore, even if a compression device is used, there is a limit to the compression rate, and even if a highly efficient compression algorithm is used, the lower limit of the wireless bandwidth is about 400 Hz.

Therefore, there is a limit to increasing the reach by reducing the wireless bandwidth.

Furthermore, the transmission radio wave output is limited by the performance of the battery used as a power source for the power amplifier, and it is difficult to continuously transmit high output radio waves.

[Purpose of the invention]

This invention improves the drawbacks of the conventional device mentioned above.
The present invention provides a portable wireless communication device that is small and has a long range.

[Summary of the invention]

The present invention temporarily stores transmission information in a memory in a wireless communication device, transmits at least part of the information in the memory in a burst manner, and uses the electrical energy necessary to transmit at least one burst signal. It is characterized in that power is supplied to the transmitting circuit from a capacitor having a capacity to store . At this time, a voltage or current stabilizing circuit may be added.

〔Effect of the invention〕

According to this invention, since transmission information is stored in a single stroke memory, modulated and transmitted in bursts, the transmission circuit #! f
It is possible to shorten the supply time for imaging to operate the power amplification circuit, and since the power is supplied from a capacitor that has been photoelectronized in advance from the battery, the internal resistance of the battery is less than 1. A large current can be supplied, making it possible to extremely increase instantaneous transmission power. Therefore, even if the device is small, it is possible to provide a portable wireless quoting device that can communicate over long distances.

[Embodiments of the invention]

The present invention will be described in detail below with reference to the drawings. 1st
The figure is a diagram showing an embodiment of a burst wireless communication device according to the present invention. In FIG. 1, transmission data inputted by the transmission message input device 1 is first stored in the memory 2. As shown in FIG. Thereafter, the information stored in this memory is sent to a transmission circuit 3 consisting of a modulation circuit and a power amplifier, and sent out from an antenna 4 as a burst radio signal.

At this time, power is supplied to the transmitting circuit using a capacitor 6 charged with a battery 5 in advance. By timing the supply of the t source to the transmitting circuit 3 immediately before transferring data from the memory to the transmitting circuit, it is possible to effectively utilize the electrical energy stored in the capacitor.

The capacitance of the capacitor is C [Farad], and the charging voltage is V [
volt], the electric energy E [zeal] stored in the capacitor is given by -cvz. Therefore, send 40 cups of this energy!
Assuming that it is consumed in r circuit (efficiency 40%).

The following relational expression is established between the power consumption P (watts) and the consumption time tL seconds of the transmitting circuit.

Pt=0.4X-CV" Therefore, C-177 uy l', Vwms Volt, P-1
At 0 watts, t = 0.4
It turns out that waves can be transmitted. This means that if the data transmission rate is 1200 bits/sec, then 600 bits
This means that s information can be sent in bursts, which means that if one character is transmitted in a row of 3t)its, a total of 75 characters can be sent in one burst. In this way, by using the electrical energy once charged in the capacitor, it is possible to send out high-output burst radio waves even when the internal resistance of the battery is high, making it possible to transmit high-output burst radio waves, making it possible to create a compact and portable device that can communicate over long distances. S communication Vi,i
jt can be realized.

In FIG. 1, there are various types of transmission message input devices, but the simplest one is input means for inputting kana characters, alphabets, etc. using key E. In addition, a pressure-sensitive device may be used to input handwritten text, figures, etc., or voice may be input. For handwritten characters, graphics, and voice input, data compression may be performed using appropriate band compression technology or recognition technology.

[Other embodiments of the invention]

Next, another embodiment of the invention will be described.

The embodiment shown in FIG. 2 basically has the same principle as the embodiment shown in FIG. 1, but is designed so that the voltage supplied from the capacitor 6 to the transmission T circuit 3 is as constant as possible. Figure 2 (a
) is an example in which a constant voltage circuit is constructed using a Zener diode 12, and FIG. 2(b) is an example in which a series regulator is used.

By adding a constant voltage circuit in this way, it is possible to achieve a more constant voltage characteristic than the discharge characteristic of a simple CR, and as a result, the electrical energy charged in the capacitor can be used more efficiently. It becomes possible to supply it to the transmitting circuit. As the constant voltage circuit, a method other than the embodiment shown in FIG. 2, such as a switching regulator or a fero-resonant constant voltage transformer, may be used.

Although the present invention has been described above with reference to several embodiments, the present invention is not limited to these embodiments in any way, and various modifications can be made without departing from the spirit of the present invention. be.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the invention, and FIG. 2 is a circuit diagram showing another embodiment of the invention. 1... Transmission message input device, 2... Memory, 3
... Transmission circuit, 5... Battery, 6... Capacitor,
7...Charging switch, 8...Discharging switch. Representative Patent Attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 (α)

Claims (2)

[Claims] (1) In a wireless communication device that temporarily stores transmission information in a memory and transmits at least part of the information in the memory in bursts, the electrical energy required to transmit at least one burst signal is used. A burst wireless communication device characterized in that power is supplied to a transmitting circuit from a capacitor having a storage capacity. (2) The burst wireless communication device according to claim 1, characterized in that a voltage or current stabilizing circuit is added when power is supplied from the capacitor to the transmitting circuit.